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Twitter redesigns to take on Facebook

Twitter's had a major redesign, aimed at making it faster, easier to navigate - and more attractive to advertisers.

Facebook upgrades internal search engine

Facebook has introduced a new feature that allows users to quickly search and connect with people, pages, groups, events and applications.

Digg reinvents itself with instant submissions

Digg is reportedly preparing to launch a revamped version of its popular service that will allow users to quickly submit "instant" Diggs without logging in.